/**
 * chat.css - 대화 영역, 메시지 카드(사용자/어시스턴트), 메타데이터(토큰/속도), 에러 및 액션
 */

.messages-scroll-area {
  flex: 1;
  min-width: 0;
  min-height: 0;
  overflow-y: auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  position: relative;
  scroll-behavior: smooth;
}

.messages-inner {
  width: 100%;
  max-width: 860px;
  min-width: 0;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 100%;
}

/* ==========================================================================
   대화 비어있음 (Empty State)
   ========================================================================== */
.chat-empty-state {
  margin: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 540px;
  padding: 40px 20px;
  gap: 20px;
  user-select: none;
}

.empty-badge-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-text);
  box-shadow: var(--shadow-sm);
}

.empty-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.empty-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.empty-server-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-size: 12px;
  color: var(--text-muted);
}


/* ==========================================================================
   메시지 아이템
   ========================================================================== */
.message-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
}

.message-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  padding: 14px 16px;
  min-width: 0;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* 사용자 메시지 스타일 */
.message-user {
  align-self: flex-end;
  max-width: 85%;
}

.message-user .message-card {
  background-color: var(--user-msg-bg);
  border-color: var(--user-msg-border);
  color: var(--user-msg-text);
  box-shadow: var(--shadow-sm);
}

/* 어시스턴트 메시지 스타일 */
.message-assistant {
  align-self: flex-start;
  width: 100%;
}

.message-assistant .message-card {
  background-color: var(--assistant-msg-bg);
  border-color: var(--assistant-msg-border);
  color: var(--assistant-msg-text);
  box-shadow: var(--shadow-sm);
}

/* 메시지 상단 헤더: 발신자 뱃지 & 액션 툴바 */
.message-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  user-select: none;
}

.message-sender {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.sender-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-xs);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--accent-text);
}

.message-user .sender-badge {
  color: #3b82f6;
  background-color: rgba(59, 130, 246, 0.1);
}

.message-assistant .sender-badge {
  color: #10b981;
  background-color: rgba(16, 185, 129, 0.1);
}

.message-time {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-weight: normal;
}

/* 메시지 호버 액션 툴바 */
.message-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.message-card:hover .message-actions,
.message-card:focus-within .message-actions {
  opacity: 1;
  pointer-events: auto;
}

.msg-action-btn {
  height: 24px;
  padding: 0 6px;
  border-radius: var(--radius-xs);
  font-size: 11px;
  color: var(--text-secondary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  gap: 4px;
}

.msg-action-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
  border-color: var(--border-normal);
}

.msg-action-btn.delete:hover {
  color: var(--danger-text);
  background-color: var(--danger-subtle);
  border-color: rgba(239, 68, 68, 0.3);
}

/* 메시지 본문 콘텐츠 */
.message-body {
  font-size: 13.5px;
  line-height: 1.65;
  word-break: break-word;
  min-width: 0;
}

.message-user .message-body {
  white-space: pre-wrap;
}

/* 스트리밍 깜빡임 커서 */
.streaming-cursor {
  display: inline-block;
  width: 6px;
  height: 14px;
  background-color: var(--accent-primary);
  vertical-align: middle;
  margin-left: 2px;
  animation: cursor-blink 0.8s infinite steps(2, start);
}

@keyframes cursor-blink {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}

/* ==========================================================================
   어시스턴트 메시지 푸터 (토큰 수 & 생성 속도)
   ========================================================================== */
.assistant-stats-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--border-subtle);
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  user-select: none;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.stat-item strong {
  color: var(--text-secondary);
  font-weight: 600;
}

.stat-divider {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background-color: var(--text-muted);
  opacity: 0.5;
}

/* ==========================================================================
   에러 메시지 카드
   ========================================================================== */
.error-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background-color: var(--danger-subtle);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger-text);
  font-size: 12px;
}

.message-body + .error-card {
  margin-top: 12px;
}

.error-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.error-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-xs);
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--danger-text);
  letter-spacing: 0.2px;
}

.error-body {
  font-family: var(--font-mono);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}

.error-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.retry-btn {
  height: 28px;
  padding: 0 12px;
  border-radius: var(--radius-xs);
  background-color: var(--danger-primary);
  color: #ffffff;
  font-size: 11px;
  font-weight: 600;
  gap: 4px;
}

.retry-btn:hover {
  background-color: var(--danger-hover);
}

/* ==========================================================================
   플로팅 "맨 아래로" 스크롤 버튼
   ========================================================================== */
.scroll-bottom-btn {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  height: 34px;
  padding: 0 14px;
  border-radius: var(--radius-full);
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-normal);
  box-shadow: var(--shadow-md);
  font-size: 12px;
  font-weight: 500;
  gap: 6px;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-fast);
}

.scroll-bottom-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.scroll-bottom-btn:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-focus);
}